Got the TBI installed, but have ignition questions - JeepForum.com

 
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post #1 of 11 Old 07-07-2010, 05:41 PM Thread Starter
Hillbillyd
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Got the TBI installed, but have ignition questions

Got the Affordable Fuel Injection kit installed over the weekend, everything went great. Jeep starts and runs down the road fine, but seems to miss at idle. It did this with the carb setup too, I just always kinda blamed the carb. The ECM doesn't have any codes, and check engine light stays off, so that's why I suspect ignition. I haven't upgraded the ignition, all stock stuff. It does have new plugs, wires, cap, and rotor though. But while idling, the engine shakes, and is generally not smooth. Checked for vacuum leaks, timing, etc. I'm going to do the team rush upgrade on the cap, rotor, and wires, and use an e-coil. I think this will help alot, but I'd like to have a multispark cdi unit as well. I'm not sure if that will work though with the fuel injection setup? The way I understand it, the ECM controls the spark now, so is it multispark already? If not, how would I wire in a multispark cdi unit?

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post #2 of 11 Old 07-08-2010, 06:35 AM
BioTex
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IMO, you would be way better off simply taking the upgrade in steps.

For instance:

Install the cap, rotor, wires and regap new plugs to .045".

Then get the timing set and see if the miss is still there. If so, do a compression test, and see if you perhaps have a weak cylinder.

Post back, and let us know. If you change out too many parts all at once, you open up a can of worms.

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post #3 of 11 Old 07-08-2010, 10:09 AM
1986cj
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You didn't get a dist with your kit or have not done no mods to yours?
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post #4 of 11 Old 07-08-2010, 12:09 PM
CSP
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I was curious about the same thing. Since the AFI kit controls spark you have to disable the mechanical and vacuum advances. Did you do that part?
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post #5 of 11 Old 07-08-2010, 12:54 PM
1986cj
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Afi's kit for a 304 comes both ways, new mod hei for spark or not, just like Howells kit.
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post #6 of 11 Old 07-08-2010, 05:20 PM Thread Starter
Hillbillyd
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Quote:
Originally Posted by 1986cj View Post
You didn't get a dist with your kit or have not done no mods to yours?
I sent them my distributor and they modified it to wire into their harness. Other than that, it's still stock.
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post #7 of 11 Old 07-08-2010, 10:32 PM
1986cj
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Did they put a GM control module in the mod dist? was it a HEI or do you still have a duraspark dist.
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post #8 of 11 Old 07-09-2010, 05:21 AM Thread Starter
Hillbillyd
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Quote:
Originally Posted by 1986cj View Post
Did they put a GM control module in the mod dist? was it a HEI or do you still have a duraspark dist.
No, it's still the stock distributor. They just changed the wiring to wire into their harness.
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post #9 of 11 Old 07-09-2010, 05:23 AM Thread Starter
Hillbillyd
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Quote:
Originally Posted by CSP View Post
I was curious about the same thing. Since the AFI kit controls spark you have to disable the mechanical and vacuum advances. Did you do that part?
I just left the vacuum unhooked to it.
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post #10 of 11 Old 07-09-2010, 08:09 AM
CSP
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What about the mechanical advance? I would assume that they disabled that along with wiring mods (which amount to adding a plug to the wires that were already there).

Have you been in contact with AFI yet?

You can add a multiple discharge cdi to your setup, but I wouldn't expect it to solve a drivability issue.
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post #11 of 11 Old 07-09-2010, 08:33 AM Thread Starter
Hillbillyd
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I actually have sent AFI an email, but they haven't responded yet. I'll call them later.
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